html,
body {
  width: 100%;
  height: 100%;
}

*,
*::after,
*::before{
  box-sizing: border-box;
  padding: 0px;
  margin: 0px;
}

.router-fade-enter-active {
  transition: opacity 0.5s;
}

.router-fade-enter,
.router-fade-leave-active {
  opacity: 0;
}

.div-center {
  display: flex;
  justify-content: center;
  align-items: center;
}